From: "H. Peter Anvin" <hpa@zytor.com>
To: Indan Zupancic <indan@nul.nu>
Cc: Will Drewry <wad@chromium.org>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
linux-doc@vger.kernel.org, kernel-hardening@lists.openwall.com,
netdev@vger.kernel.org, x86@kernel.org, arnd@arndb.de,
davem@davemloft.net, mingo@redhat.com, oleg@redhat.com,
peterz@infradead.org, rdunlap@xenotime.net,
mcgrathr@chromium.org, tglx@linutronix.de, luto@mit.edu,
eparis@redhat.com, serge.hallyn@canonical.com, djm@mindrot.org,
scarybeasts@gmail.com, pmoore@redhat.com,
akpm@linux-foundation.org, corbet@lwn.net,
eric.dumazet@gmail.com, markus@chromium.org,
coreyb@linux.vnet.ibm.com, keescook@chromium.org
Subject: Re: [PATCH v12 06/13] seccomp: add system call filtering using BPF
Date: Thu, 01 Mar 2012 22:55:30 -0800 [thread overview]
Message-ID: <4F506EE2.1050705@zytor.com> (raw)
In-Reply-To: <bc1b4ec8fbad5a5931a928f108a6095f.squirrel@webmail.greenhost.nl>
On 03/01/2012 10:43 PM, Indan Zupancic wrote:
> On Fri, March 2, 2012 06:52, H. Peter Anvin wrote:
>> On 03/01/2012 09:45 PM, Indan Zupancic wrote:
>>>
>>>> + * @nr: the system call number
>>>> + * @arch: indicates system call convention as an AUDIT_ARCH_* value
>>>> + * as defined in <linux/audit.h>.
>>>> + * @instruction_pointer: at the time of the system call.
>>>
>>> If the vDSO is used this will always be the same, so what good is this?
>>> I haven't gotten an answer to this yet.
>>>
>>
>> And if it isn't, or you're on an architecture which doesn't use the vdso
>> as the launching point, it's not.
>
> True, but then what?
>
Ok, fail on my part - I misread the above to refer to @arch, not
@instruction_pointer.
>> -- Pin is a great example.
> Is that http://www.pintool.org/?
>
> Can you explain how knowing the IP is useful for Pin?
>
> All I am asking for is just one use case for providing the IP. Is that
> asking for too much?
However, it still applies. For something like Pin, Pin may want to trap
on all or a subset from the instrumented program, while the
instrumentation code -- which lives in the same address space -- needs
to execute those same instructions.
Yes, it's useless for *security* (unless perhaps if you keep very strict
tabs on the flow of control by using debug registers, dynamic
translation or whatnot), but it can be highly useful for
*instrumentation*, where you want to analyze the behavior of a
non-malicious program.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2012-03-02 6:55 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-29 23:53 [PATCH v12 01/13] sk_run_filter: add support for custom load_pointer Will Drewry
2012-02-29 23:53 ` Will Drewry
2012-02-29 23:53 ` [PATCH v12 02/13] net/compat.c,linux/filter.h: share compat_sock_fprog Will Drewry
2012-02-29 23:53 ` Will Drewry
2012-02-29 23:53 ` [PATCH v12 03/13] seccomp: kill the seccomp_t typedef Will Drewry
2012-02-29 23:53 ` Will Drewry
2012-02-29 23:53 ` [PATCH v12 04/13] asm/syscall.h: add syscall_get_arch Will Drewry
2012-02-29 23:53 ` Will Drewry
2012-02-29 23:53 ` [PATCH v12 05/13] arch/x86: add syscall_get_arch to syscall.h Will Drewry
2012-02-29 23:53 ` Will Drewry
2012-02-29 23:53 ` [PATCH v12 06/13] seccomp: add system call filtering using BPF Will Drewry
2012-02-29 23:53 ` Will Drewry
2012-03-02 5:45 ` Indan Zupancic
2012-03-02 5:45 ` Indan Zupancic
2012-03-02 5:52 ` H. Peter Anvin
2012-03-02 5:52 ` H. Peter Anvin
2012-03-02 6:43 ` Indan Zupancic
2012-03-02 6:43 ` Indan Zupancic
2012-03-02 6:55 ` H. Peter Anvin [this message]
2012-03-02 6:55 ` H. Peter Anvin
2012-03-02 8:12 ` Indan Zupancic
2012-03-02 8:12 ` Indan Zupancic
2012-03-02 18:44 ` [kernel-hardening] " Will Drewry
2012-03-02 18:44 ` Will Drewry
2012-02-29 23:53 ` [PATCH v12 07/13] seccomp: add SECCOMP_RET_ERRNO Will Drewry
2012-02-29 23:53 ` Will Drewry
2012-03-02 18:24 ` Serge E. Hallyn
2012-03-02 18:24 ` Serge E. Hallyn
2012-03-05 21:03 ` Will Drewry
2012-03-05 21:03 ` Will Drewry
2012-03-05 21:13 ` Serge Hallyn
2012-03-05 21:13 ` Serge Hallyn
2012-02-29 23:53 ` [PATCH v12 08/13] signal, x86: add SIGSYS info and make it synchronous Will Drewry
2012-02-29 23:53 ` Will Drewry
2012-02-29 23:53 ` [PATCH v12 09/13] seccomp: Add SECCOMP_RET_TRAP Will Drewry
2012-02-29 23:53 ` Will Drewry
2012-02-29 23:53 ` [PATCH v12 10/13] ptrace,seccomp: Add PTRACE_SECCOMP support Will Drewry
2012-02-29 23:53 ` Will Drewry
2012-02-29 23:53 ` [PATCH v12 11/13] x86: Enable HAVE_ARCH_SECCOMP_FILTER Will Drewry
2012-02-29 23:53 ` Will Drewry
2012-02-29 23:53 ` [PATCH v12 12/13] Documentation: prctl/seccomp_filter Will Drewry
2012-02-29 23:53 ` Will Drewry
2012-02-29 23:53 ` [PATCH v12 13/13] seccomp: remove duplicated failure logging Will Drewry
2012-02-29 23:53 ` Will Drewry
2012-03-01 23:37 ` [PATCH v12 01/13] sk_run_filter: add support for custom load_pointer Kees Cook
2012-03-01 23:37 ` Kees Cook
2012-03-02 0:05 ` H. Peter Anvin
2012-03-02 0:05 ` H. Peter Anvin
2012-03-02 0:22 ` Andrew Lutomirski
2012-03-02 0:47 ` Stephen Rothwell
2012-03-02 0:47 ` Stephen Rothwell
2012-03-02 0:57 ` Kees Cook
2012-03-02 1:19 ` Andrew Morton
2012-03-02 1:19 ` Andrew Morton
2012-03-02 2:39 ` Will Drewry
2012-03-02 2:39 ` Will Drewry
2012-03-02 4:04 ` Indan Zupancic
2012-03-02 4:04 ` Indan Zupancic
2012-03-02 5:03 ` Stephen Rothwell
2012-03-02 5:03 ` Stephen Rothwell
2012-03-02 5:26 ` Kees Cook
2012-03-02 5:26 ` Kees Cook
2012-03-02 1:48 ` Andrew Lutomirski
2012-03-02 3:10 ` Stephen Rothwell
2012-03-02 3:41 ` Will Drewry
2012-03-02 3:41 ` Will Drewry
2012-03-02 3:57 ` Stephen Rothwell
2012-03-02 3:57 ` Stephen Rothwell
2012-03-02 0:47 ` Eric Dumazet
2012-03-02 10:40 ` Indan Zupancic
2012-03-02 10:40 ` Indan Zupancic
2012-03-02 18:47 ` Will Drewry
2012-03-02 18:47 ` Will Drewry
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